Split laptop/work into independent stow packages with shared/ base

- Remove work/laptop detection logic from nvim and emacs configs; each
  package now has a self-contained init that requires no runtime checks
- Create shared/ stow package containing nvim/init.lua, emacs/init.el,
  common-dev-settings.el, org-bindings.el, tmux, ghostty, and ranger
- Rename laptop-languages.lua / work-languages.lua → languages.lua in
  each package; shared/init.lua uses require('languages') generically
- Rename work-dev-settings.el → dev-settings.el to match laptop naming
- Expand work/ to include the full set of dev tools (tmux, ghostty,
  ranger, emacs, neovim) without email/calendar tooling
- Add Makefile with `make laptop` and `make work` targets (each runs
  a single `stow shared <profile>` invocation)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

shared/.config/ranger/rc.conf

@@ -0,0 +1,11 @@
+set colorscheme catppuccin
+set preview_images true
+set preview_images_method kitty
+set unicode_ellipsis true
+set show_hidden false
+set confirm_on_delete multiple
+set use_preview_script true
+set automatically_count_files true
+set open_all_images true
+set vcs_aware true
+set vcs_backend_git enabled